The phrase "as the primary tumor" is correct and usable in written English.
It can be used in medical contexts to refer to the original tumor from which metastases may arise.
Example: "The patient was diagnosed with multiple lesions, with the largest being identified as the primary tumor."
Alternatives: "as the original tumor" or "as the main tumor".
The largest thoracic lesion was defined as the primary tumor.
The basis for this diagnosis is when implanted cells have the same histologic type as the primary tumor.
In making the differential diagnosis of metastatic disease, several immunohistochemical (IHC) markers are useful for identifying breast cancer as the primary tumor.
The probability of surviving breast cancer decreases dramatically as the primary tumor size and the number of axillary lymph nodes positive for cancer increases.
As the primary tumor size was markedly reduced after four courses of DCF and new lesions were not observed during approximately 5 months of chemotherapy, we assumed that this case of radical cure of cancer was due to the relatively localized disease.
The stroma surrounding a tumor is continually changing in composition and structure as the primary tumor cells progress to invasion and metastasis, a process termed stromagenesis [8], [9].
Microenvironmental cues are thought to play important roles at the secondary site, as well as at the primary tumor.
Although cancer stem cells are now widely believed to be responsible for tumor recurrence, we do not know whether such cells are exactly the same in recurrent tumors as in the primary tumor in cases of malignancy progression.
In breast carcinoma approximately 80% of stromal fibroblasts may acquire the activated phenotype that promotes the proliferation of cancer cells at metastatic sites, stimulating tumor growth such as for the primary tumor (Kalluri and Zeisberg 2006).
We also observed X chromosome hypermutation in a recurrence of medulloblastoma MB34 (Jones et al., 2012), with the same degree of hypermutation as in the primary tumor despite a higher number of mutations genome wide (data not shown).
Initially, metastasis was evaluated in WT or KO tumor recipients by harvesting lungs on the same day as the primary tumors.
